package pt.up.beta.mobile.utils;


/**
 * 
 *
 */
public class StringUtils {
	
	 // private constructor, can't be instanciated! 
	private StringUtils() {}

	private static final String PLAIN_ASCII =
	      "AaEeIiOoUu"    // grave
		+ "AaEeIiOoUuYy"  // acute
		+ "AaEeIiOoUuYy"  // circumflex
		+ "AaOoNn"        // tilde
		+ "AaEeIiOoUuYy"  // umlaut
		+ "Aa"            // ring
		+ "Cc"            // cedilla
		+ "OoUu"          // double acute
		;

	 
	private static final String UPPERCASE_ASCII =
	    "AEIOU" // grave
		+ "AEIOUY" // acute
		+ "AEIOUY" // circumflex
		+ "AON" // tilde
		+ "AEIOUY" // umlaut
		+ "A" // ring
		+ "C" // cedilla
		+ "OU" // double acute
		;

	private static final String UNICODE =
	     "\u00C0\u00E0\u00C8\u00E8\u00CC\u00EC\u00D2\u00F2\u00D9\u00F9"
	    + "\u00C1\u00E1\u00C9\u00E9\u00CD\u00ED\u00D3\u00F3\u00DA\u00FA\u00DD\u00FD"
	    + "\u00C2\u00E2\u00CA\u00EA\u00CE\u00EE\u00D4\u00F4\u00DB\u00FB\u0176\u0177"
	    + "\u00C3\u00E3\u00D5\u00F5\u00D1\u00F1"
	    + "\u00C4\u00E4\u00CB\u00EB\u00CF\u00EF\u00D6\u00F6\u00DC\u00FC\u0178\u00FF"
	    + "\u00C5\u00E5"
	    + "\u00C7\u00E7"
	    + "\u0150\u0151\u0170\u0171"
	    ;
	  
	private static final String UPPERCASE_UNICODE =
		    "\u00C0\u00C8\u00CC\u00D2\u00D9"
		+ "\u00C1\u00C9\u00CD\u00D3\u00DA\u00DD"
		+ "\u00C2\u00CA\u00CE\u00D4\u00DB\u0176"
		+ "\u00C3\u00D5\u00D1"
		+ "\u00C4\u00CB\u00CF\u00D6\u00DC\u0178"
		+ "\u00C5"
		+ "\u00C7"
		+ "\u0150\u0170"
		    ;
  

    // remove accentued from a string and replace with ascii equivalent
    public static String convertNonAscii(String s) {
       if (s == null) return null;
       StringBuilder sb = new StringBuilder();
       int n = s.length();
       for (int i = 0; i < n; i++) {
          char c = s.charAt(i);
          int pos = UNICODE.indexOf(c);
          if (pos > -1){
              sb.append(PLAIN_ASCII.charAt(pos));
          }
          else {
              sb.append(c);
          }
       }
       return sb.toString();
    }

    public static String toUpperCaseSansAccent(String txt) {
       if (txt == null) {
          return null;
       }
       String txtUpper = txt.toUpperCase();
       StringBuilder sb = new StringBuilder();
       int n = txtUpper.length();
       for (int i = 0; i < n; i++) {
          char c = txtUpper.charAt(i);
          int pos = UPPERCASE_UNICODE.indexOf(c);
          if (pos > -1){
            sb.append(UPPERCASE_ASCII.charAt(pos));
          }
          else {
            sb.append(c);
          }
       }
       return sb.toString();
    }

    public static String removeChar(String s, char c) {
    	  StringBuffer r = new StringBuffer( s.length() );
    	  r.setLength( s.length() );
    	  int current = 0;
    	  for (int i = 0; i < s.length(); i ++) {
    	     char cur = s.charAt(i);
    	     if (cur != c) r.setCharAt( current++, cur );
    	  }
    	  return r.toString().trim();
    }

}
